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628e341f31
In xfrm4 and xfrm6 we need to take care about sockets of the other address family. This could happen because a 6in4 or 4in6 tunnel could get protected by ipsec. Because we don't want to have a run-time dependency on ipv6 when only using ipv4 xfrm we have to embed a pointer to the correct local_error function in xfrm_state_afinet and look it up when returning an error depending on the socket address family. Thanks to vi0ss for the great bug report: <https://bugzilla.kernel.org/show_bug.cgi?id=58691> v2: a) fix two more unsafe interpretations of skb->sk as ipv6 socket (xfrm6_local_dontfrag and __xfrm6_output) v3: a) add an EXPORT_SYMBOL_GPL(xfrm_local_error) to fix a link error when building ipv6 as a module (thanks to Steffen Klassert) Reported-by: <vi0oss@gmail.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/*
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* xfrm4_state.c
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*
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* Changes:
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* YOSHIFUJI Hideaki @USAGI
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* Split up af-specific portion
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*
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*/
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#include <net/ip.h>
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#include <net/xfrm.h>
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#include <linux/pfkeyv2.h>
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#include <linux/ipsec.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/export.h>
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static int xfrm4_init_flags(struct xfrm_state *x)
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{
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if (ipv4_config.no_pmtu_disc)
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x->props.flags |= XFRM_STATE_NOPMTUDISC;
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return 0;
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}
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static void
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__xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
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{
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const struct flowi4 *fl4 = &fl->u.ip4;
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sel->daddr.a4 = fl4->daddr;
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sel->saddr.a4 = fl4->saddr;
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sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
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sel->dport_mask = htons(0xffff);
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sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
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sel->sport_mask = htons(0xffff);
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sel->family = AF_INET;
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sel->prefixlen_d = 32;
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sel->prefixlen_s = 32;
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sel->proto = fl4->flowi4_proto;
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sel->ifindex = fl4->flowi4_oif;
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}
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static void
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xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
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const xfrm_address_t *daddr, const xfrm_address_t *saddr)
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{
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x->id = tmpl->id;
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if (x->id.daddr.a4 == 0)
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x->id.daddr.a4 = daddr->a4;
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x->props.saddr = tmpl->saddr;
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if (x->props.saddr.a4 == 0)
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x->props.saddr.a4 = saddr->a4;
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x->props.mode = tmpl->mode;
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x->props.reqid = tmpl->reqid;
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x->props.family = AF_INET;
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}
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int xfrm4_extract_header(struct sk_buff *skb)
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{
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const struct iphdr *iph = ip_hdr(skb);
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XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
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XFRM_MODE_SKB_CB(skb)->id = iph->id;
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XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
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XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
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XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
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XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
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memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
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sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
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return 0;
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}
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static struct xfrm_state_afinfo xfrm4_state_afinfo = {
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.family = AF_INET,
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.proto = IPPROTO_IPIP,
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.eth_proto = htons(ETH_P_IP),
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.owner = THIS_MODULE,
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.init_flags = xfrm4_init_flags,
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.init_tempsel = __xfrm4_init_tempsel,
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.init_temprop = xfrm4_init_temprop,
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.output = xfrm4_output,
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.output_finish = xfrm4_output_finish,
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.extract_input = xfrm4_extract_input,
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.extract_output = xfrm4_extract_output,
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.transport_finish = xfrm4_transport_finish,
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.local_error = xfrm4_local_error,
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};
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void __init xfrm4_state_init(void)
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{
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xfrm_state_register_afinfo(&xfrm4_state_afinfo);
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}
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#if 0
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void __exit xfrm4_state_fini(void)
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{
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xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
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}
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#endif /* 0 */
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